As to running London services via HS2, there could be a case for running 400m trains on the new lines and then splitting to serve two locations on the existing network.
With the limitations as ooc and at handsacre/colwich, I think that's very likely they will need to split at Crewe. 8 trains an hour limitation at ooc, gives 5 going north of Birmingham. Will make for a potentially less reliable journey though.
So it easily wins versus the classic train.
Once you change from your service from the SW, no it doesn't.
If you look at the ODM data it is clear that you have to go very far down the destination list for York before you get a station south west of Birmingham. I haven't tried it for the other stations beyond York but I can't imagine it will be much different.
York is a major interchange for other destinations and we are talking about the entire South West, rather than specific stations on that line. Newcastle also, there's a reason express services on ecml call at these two stations. Just looking at specific york-somewhereSW isn't going to show you the demand.
Well you wouldn't necessarily need 400m platforms in Leeds.
You could operate ~325m (< 340m) trainsets into two platforms at Leeds, two at York and one in Newcastle
Its not the length of the platforms that's the primary concern. Leeds is full, requires new platforms and the current configuration is constrained. The benefit of hs2 was to create new platforms at a T to the current station, which added capacity for through services. If you're building new 325m platforms, might as well go ahead and build new 400m platforms. Whatever happens, Leeds needs expansion especially if you're building a new line across the pennines.
I'm not surprised, Bristol to York is 4 hours wedged in a Voyager with XC's extortionate fares. Quite a lot of the passengers will be on split tickets so even those who are making the full journey will not appear in the statistics (instead appearing as two separate short journeys). Lengthening formations, cutting fares and cutting journey times would change this dramatically
Exactly and the modal share of journeys along that route is likely low for rail as a result. The M1 following that routes had to be widened due to demand. Midlands Connect often included modal comparisons in their proposals. On the attached, they show Leicester-Leeds compared to Newcastle-Leeds. It wouldn't just be Leicester, or Leeds, in that state either either, there's a cluster of towns and cities that would have benefited. EM-Yorks/NE has a poor connection, but as it's not a London flow, people don't care.
We shouldn't go off just the current demand, but the potential to grow.
One thing that I wonder about HS2 Phase 2a is that there do not seem to be so many local objections to it compared to Phase 1 ?.
This group are/were quite active
https://www.srcg.uk/. I believe they have contributed to Michael Byng's work, along with the original funders, and have appeared at the TSC as witnesses. I'd suggest filing under "blockers" in the Rachel Reeves definition of the word.